The exact value of cos(-5pi/3) can be written in the form ((a sqr root b)/c) .
Determine the values of a, b and c.
I know that the angle is -300 therefore the reference angle is 60 in the first quadrant. Also, by looking at the special angles I know that b and c are 1/2, but will 'a' be positive or negative ?

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The exact value of cos(-5pi/3) can be written in the form ((a sqr root b)/c) .
Determine the values of a, b and c.
I know that the angle is -300 therefore the reference angle is 60 in the first quadrant. Also, by looking at the special angles I know that b and c are 1/2, but will 'a' be positive or negative ?

Mathematics

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